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Date: Mon, 28 Feb 2011 12:26:20 +0800 From: Herbert Xu <herbert@...dor.apana.org.au> To: Tom Herbert <therbert@...gle.com> Cc: David Miller <davem@...emloft.net>, rick.jones2@...com, wsommerfeld@...gle.com, daniel.baluta@...il.com, netdev@...r.kernel.org Subject: Re: SO_REUSEPORT - can it be done in kernel? On Sun, Feb 27, 2011 at 07:45:55PM -0800, Tom Herbert wrote: > That sounds promising, but receive side will still have problems. > There is lock contention on the queue as well as cache line bouncing > on the sock structures. Also multiple threads sleeping on same socket > typically leads to asymmetric load across the threads (and > degenerative cases where receiving thread is woken up and other > threads have already processed all the packets). TCP listener threads > suffer from these same problems. IOW this is something that we have to solve anyway. I'm just being overly cautious here because user-space API changes are something that we should not enter into lightly. If this patch was completely internal to the kernel, then I would have much less of an objection as we can always revert/change it later on. With a user-space API we don't have that flexibility. Thanks, -- Email: Herbert Xu <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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